Truss-bar concrete construction.



- zn. MAXWELL. TRUSS BAE CONSTRUCTION. l

1 UNITED sTaTEs PATENT orricii;

l435 the purpose of receiving the webbing or lae- DAVID MAXWELL, or DETROIL'MICHIGAN.

I TRUSS-BAR FOR CONCRETE CONSTRUCTION.

Patented June 6, 1911.

Application :filed October J17, 1907; Serial No. 397,842.

To all whom it'may concern.

Be it known that I, Davie MAXWELL, of Detroit, `Wayne count-y, Michigan, have invented a new .and useful Truss-Bar for Concrete Construction, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in wliich- Figure 1 is a plan view of a bar embodying my invention; Fig. 2 is a cross-section of the saine; and Fig. 3 is a side view.

My invention has relation to metal reinforcements for concrete construction of the character more fully described and lclaimed in my Patent No. 859,314, datedJuly 9th, Said patent discloses a reinforcing truss for concrete construction having a flanged tension member, the flanges being notched to receive a webbing or lacing.

The present invention relates more par-` ticularly to the construction of the tension bar, and is designed to provide a bar ofthis character which shall havev a substantially uniform cross-section at all points of its` length, and which is provided with ribs or corrugati'ons for bonding the bar in the surrounding concrete.

My invention will be best understood by reference to the accompanying drawing, iii

which the numeral 2 designates the body portion of a bar embodying my invention. This bar is formed with the lateral flanges ing. As originally formed, the bar has a convex lower portion, which is indented at intervals to form a series of corrugations or depressions 5 the vmaterial thereby displaced being forced laterally so as to forni the angu" 'lar projections 6. v

The upper face of the bar is fernlil with a `plurality of transverse ribs or corrugations The upper surfaces of these ribs or corrugations are inclined, so that a portion of each is below the general plane of the top surface of the bar, while another portion is below Such plane to an equal extent, adjacent corrugations being rcversely inclined. By this arrangement of the corrugations, provision is made for securely bonding the bar in the surrounding concrete, a portion of which will embed itself between each adjacent pair of ribs or corrugations, while a portion of each rib or corrugation will embed itself in the body of concrete outside of the plane of the surface ofthe-bar. At the points where the flanges are notched to receive the lacing orpwebbing, a break is made in the eorrugating, but the upper surface of the bar at this point is preferably refzinforced as indicated at 8, to provide an amount of additional metal substantially equal to that which is removed in forming the not-ches 4. The corrugations 5, together with the angular ribs o r projections 6 also form bonding means, as Well as means for holding the lacing' or webbing in place.

I do not claim herein broadly the feature of a bar having a corrugated face of the character described, inasmuch as this feature is broadly claimed in my copending applicawith. p

Vhat I claim is 1. vA truss bar for concrete reinforcement having laterally extending notched flanges,

rnd its upper face between said flangesformed with a plurality -of transverse deformations, portions of which areabove the plane ofthe upper surfaces ofthe flanges, -and other portions of which are `'below such uflanges; substantially asldescribed A. truss .bar for concretereinforcement having notched lateral flanges, and a pludeformations between said `flanges,

rality ,of each deformation constituting a ing transversely of the b. .1', deform ations having reversely surfaces, substantially rib'v extendand adjacent inclined upper "as described.

3. A truss bari for concrete reinforcementhaving notched Y"lateral flanges and a plurality of deformations between said flanges each deformation constituting a rib extending transversely of the bar and having an inclined upper surface portion above the plane of the upper surfaces of theilanges, adjacent deformations having their upper surfaces inclined in opposite` directions.

.4. A truss bar form'concr te reinforcement, having notched lateral flanges, aV` convexportion below the flanges having parts thereof displaced laterally to"form deformations, and an upper surface formed with transverse deformations", adjacent deformations being inclined 'in `opposite directions, and portions of each of the inclined surfaces thereof being respectively above and below the plane Vof the upper surface of the flanges;

substantially Aas described. 5. A reinforcing bar for concrete, consistingf a semi-cylindrical bar having portions displaced laterally in form bar portions of tle bottom faces of .which are approximately straight longitudinal of the bar, said portions alternating with portions which are of substantially the original cross-section of the bar and which join the same by abrupt shoulders; substantially as described.

A reinforcing bar for concrete of general semi-cylindrical cross-section, and having laterally projecting flanges at its top,

said flanges being notched at lntervals to re` ceive lacing members, the convex surface of' the bar being deformed to provide a plurality of bonding projections, and the top surface of the bar intermediate the flanges also having bonding deformations; substantially as described.

In testimony whereof, I have hereunto set my hand.

l DAVID MAXWELL.

Witnesses:

HAROLD MolN'rrRe, J WALTER S. WHEELER. 

